การเขียนไฟล์จาก database ด้วย Java

String DEFAULT_PATH = "c:\";
int errCode = 0 ;
String errDesc = ""
;try {
writer = new BufferedWriter(new OutputStreamWriter(
 new FileOutputStream(DEFAULT_PATH+"bestmodeltrain.csv"), "utf-8"));
String sqlupdate = "SELECT FILE_DES FROM DATA_FILE WHERE FILE_NAME = 'Train.csv'";
ResultSet rsdes= (ResultSet) new ConnectionDB().connectoDB(sqlupdate);
while (rsdes.next()) {
writer.write(rsdes.getString("FILE_DES"));
}
}
catch (IOException ex) {
errCode = -4;
errDesc = "IOException ==> "+ex;
}
catch(SQLException ex){
errCode = -5;
errDesc = "SQLException ==> "+ex;
}